feat: Add Learn-Number tool for preschool math practice and refactor HTML components

2026-02-25 19:22:58 -08:00
parent e320f9ee50
commit 0be94026c5
9 changed files with 396 additions and 82 deletions
@@ -0,0 +1,168 @@
+package logic
+
+import (
+	"bytes"
+	"math"
+	"math/rand"
+	"regexp"
+	"strconv"
+	"strings"
+	"time"
+	"toolbox/pkg/learnnumber/data"
+
+	"github.com/signintech/gopdf"
+)
+
+type CountingRequest struct {
+	TotalCount int    `json:"total_count"`
+	IconTypes  int    `json:"icon_types"`
+	PaperSize  string `json:"paper_size"`
+}
+
+var reSVG = regexp.MustCompile(`([MLQCZmlqcz])|(-?\d+\.?\d*)`)
+
+func GenerateCountingPDF(req CountingRequest) ([]byte, error) {
+	rand.Seed(time.Now().UnixNano())
+	pdf := &gopdf.GoPdf{}
+	rect := gopdf.Rect{W: 595.28, H: 841.89}
+	if req.PaperSize == "Letter" { rect = gopdf.Rect{W: 612, H: 792} }
+	pdf.Start(gopdf.Config{PageSize: rect})
+	pdf.AddPage()
+
+	drawProblem(pdf, req, 0, rect.W, rect.H/2)
+	drawProblem(pdf, req, rect.H/2, rect.W, rect.H/2)
+
+	var buf bytes.Buffer
+	_, err := pdf.WriteTo(&buf)
+	return buf.Bytes(), err
+}
+
+func drawProblem(pdf *gopdf.GoPdf, req CountingRequest, startY, pW, pH float64) {
+	margin := 40.0
+	boxW := (pW - 2*margin) * 0.7
+	boxH := pH - 60.0
+	x, y := margin, startY + 30.0
+
+	// 1. 绘制方框
+	pdf.SetStrokeColor(0, 0, 0); pdf.SetLineWidth(2.0)
+	pdf.RectFromUpperLeft(x, y, boxW, boxH)
+
+	// 2. 分配图标数量
+	numTypes := req.IconTypes; if numTypes < 1 { numTypes = 1 }
+	if numTypes > len(data.CountingIcons) { numTypes = len(data.CountingIcons) }
+	
+	total := req.TotalCount; if total < numTypes { total = numTypes }
+	if total > 30 { total = 30 }
+
+	// 随机选出图标种类
+	allIcons := rand.Perm(len(data.CountingIcons))
+	selectedIcons := []data.Icon{}
+	counts := []int{}
+	
+	// 先每种分配1个
+	rem := total - numTypes
+	for i := 0; i < numTypes; i++ {
+		selectedIcons = append(selectedIcons, data.CountingIcons[allIcons[i]])
+		counts = append(counts, 1)
+	}
+	// 随机分配剩下的
+	for i := 0; i < rem; i++ {
+		counts[rand.Intn(numTypes)]++
+	}
+
+	// 3. 布局计划 (使用网格，增加 Padding 避开边框)
+	rows, cols := 5, 6
+	cellW, cellH := boxW/float64(cols), boxH/float64(rows)
+	indices := rand.Perm(rows * cols)
+	
+	// 严格图标大小：单元格的 70%，确保不溢出单元格边界
+	iconSize := math.Min(cellW, cellH) * 0.7
+	paddingX, paddingY := (cellW - iconSize)/2, (cellH - iconSize)/2
+
+	iconTypeIdx := 0
+	countInCurrentType := 0
+	
+	for i := 0; i < total; i++ {
+		cellIdx := indices[i]
+		rIdx, cIdx := cellIdx/cols, cellIdx%cols
+		
+		// 基础位置
+		baseX := x + float64(cIdx)*cellW + paddingX
+		baseY := y + float64(rIdx)*cellH + paddingY
+		
+		// 渲染图标
+		drawIcon(pdf, selectedIcons[iconTypeIdx], baseX + iconSize/2, baseY + iconSize/2, iconSize)
+		
+		countInCurrentType++
+		if countInCurrentType >= counts[iconTypeIdx] {
+			iconTypeIdx++
+			countInCurrentType = 0
+		}
+	}
+
+	// 4. 绘制右侧对照表
+	legendX := x + boxW + 20.0
+	legendStepY := boxH / float64(numTypes + 1)
+	for i := 0; i < numTypes; i++ {
+		lY := y + float64(i+1)*legendStepY
+		drawIcon(pdf, selectedIcons[i], legendX + 20, lY, 30)
+		pdf.SetStrokeColor(150, 150, 150); pdf.SetLineWidth(0.8)
+		pdf.RectFromUpperLeft(legendX + 50, lY - 15, 30, 30)
+	}
+}
+
+func drawIcon(pdf *gopdf.GoPdf, icon data.Icon, cX, cY, size float64) {
+	scale := size / 1024.0
+	pdf.SetStrokeColor(0, 0, 0); pdf.SetLineWidth(1.5) // 加粗线条
+	
+	ox, oy := cX - size/2, cY - size/2
+	for _, pStr := range icon.Paths {
+		pts := parseSmoothPath(pStr, scale, ox, oy)
+		if len(pts) > 1 {
+			// 如果是闭合路径
+			if strings.Contains(strings.ToUpper(pStr), "Z") {
+				pdf.Polygon(pts, "D")
+			} else {
+				for i := 0; i < len(pts)-1; i++ {
+					pdf.Line(pts[i].X, pts[i].Y, pts[i+1].X, pts[i+1].Y)
+				}
+			}
+		}
+	}
+}
+
+// 支持贝塞尔曲线采样，确保图标圆润
+func parseSmoothPath(path string, scale, ox, oy float64) []gopdf.Point {
+	var pts []gopdf.Point
+	matches := reSVG.FindAllStringSubmatch(path, -1)
+	var lx, ly float64
+	for i := 0; i < len(matches); {
+		cmd := matches[i][0]
+		if cmd == "M" || cmd == "L" {
+			x, _ := strconv.ParseFloat(matches[i+1][0], 64); y, _ := strconv.ParseFloat(matches[i+2][0], 64)
+			lx, ly = x, y
+			pts = append(pts, gopdf.Point{X: ox + x*scale, Y: oy + y*scale})
+			i += 3
+		} else if cmd == "C" {
+			x1, _ := strconv.ParseFloat(matches[i+1][0], 64); y1, _ := strconv.ParseFloat(matches[i+2][0], 64)
+			x2, _ := strconv.ParseFloat(matches[i+3][0], 64); y2, _ := strconv.ParseFloat(matches[i+4][0], 64)
+			x, _ := strconv.ParseFloat(matches[i+5][0], 64); y, _ := strconv.ParseFloat(matches[i+6][0], 64)
+			for t := 0.25; t <= 1.0; t += 0.25 {
+				tx := math.Pow(1-t, 3)*lx + 3*math.Pow(1-t, 2)*t*x1 + 3*(1-t)*math.Pow(t, 2)*x2 + math.Pow(t, 3)*x
+				ty := math.Pow(1-t, 3)*ly + 3*math.Pow(1-t, 2)*t*y1 + 3*(1-t)*math.Pow(t, 2)*y2 + math.Pow(t, 3)*y
+				pts = append(pts, gopdf.Point{X: ox + tx*scale, Y: oy + ty*scale})
+			}
+			lx, ly = x, y; i += 7
+		} else if cmd == "Q" {
+			x1, _ := strconv.ParseFloat(matches[i+1][0], 64); y1, _ := strconv.ParseFloat(matches[i+2][0], 64)
+			x, _ := strconv.ParseFloat(matches[i+3][0], 64); y, _ := strconv.ParseFloat(matches[i+4][0], 64)
+			for t := 0.25; t <= 1.0; t += 0.25 {
+				tx := math.Pow(1-t, 2)*lx + 2*(1-t)*t*x1 + math.Pow(t, 2)*x
+				ty := math.Pow(1-t, 2)*ly + 2*(1-t)*t*y1 + math.Pow(t, 2)*y
+				pts = append(pts, gopdf.Point{X: ox + tx*scale, Y: oy + ty*scale})
+			}
+			lx, ly = x, y; i += 5
+		} else { i++ }
+	}
+	return pts
+}